It seriously depends on who you are and how you feel about a lot of things. For me it was Emi, I don't want to give much spoilers but there's some Alpha emotions in her path if you have a real life connection. Again it just depends on how you feel.

Emi reminds me of my girlfriend in personality, she's hesitant to talk about what bothers her. That's part of the reason why I don't plan on going through a second playthrough, I don't want to see Emi and and up with another one and feel bad, and it kind of sucks after the ending, knowing there isn't anything else to do with her in the relationship. Any advice on why I should play again on a different route?

Nah, I had tons of feels. It's just that if I play through I feel as if I'm going to feel bad seeing Emi and then going with a different girl. Emi definitely is, as of right now, my favorite (as if I had played any of the others to choose one) and that's what keeps me hesitant to play again. I'll admit, to find out after her ending that I couldn't do more with her disappointed me.

No ***** it means you got the love but you don't know how to express it so you put it aside. How do I know? because you won't play someone else even with Emi having a bad ending for you, you feel like the experience is enough to love her.

Negro you got the Waifu and the shindig. I'll advise you to go with Hanako next or Shizune. Leave Lilly for the end because that's a 10/10 best ending. Rin is idk...

For me it was Lilly. But that's because it was closest to home like said other repliers. I don't want to spoil anything, but uhhh, Lilly is also the hottest and her line is the most.... intimate, in my opinion. Honestly, Lilly has the best everything, including feels.

It's different for most people. For me it was Rin because her problems cut really close to home for me as well as Emi. But I've heard for others it was Hanako or Lilly that gave them feels.
Guess it depends who you are, really.